Geodesic
An Invariant of a Pair of Almost Commuting Unbounded Operators
Funkcionalʹnyj analiz i ego priloženiâ, Tome 32 (1998) no. 4, pp. 88-91 
V. M. Manuilov. An Invariant of a Pair of Almost Commuting Unbounded Operators. Funkcionalʹnyj analiz i ego priloženiâ, Tome 32 (1998) no. 4, pp. 88-91. http://geodesic.mathdoc.fr/item/FAA_1998_32_4_a12/
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     title = {An {Invariant} of a {Pair} of {Almost} {Commuting} {Unbounded} {Operators}},
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     number = {4},
     language = {ru},
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